Wheel-pulling jack.



L. BERK. v WHEEL PULLINGJACK. APPLICATION FILED APR. 10. 19H.

Patented Feb. 26, 1918.

INVENTOR WITNESSES ATTORNEY LOUIS BERK, F ALSTOWN, WASHING-TON.

WHEELIPULLING JACK;

mamas.

' Specification of Letters Iatent.

Patented Feb. 26, 1.212.

To all whom it may concern:

Be it known that 1, Lou s Benn, a citizen of the United States, residing at Alstown, in the county of Douglas and State of Washington, have invented new and useful Improvements in VVheel-Pulling Jacks, of which the following is a specification.

This invention relates to pulling implements, and more especially to those of the screw type embodying special engaging features; and the object of the same is to produce a jack by means of which a pinion, sprocket, or other type of wheel may be removed from a shaft on which it is stuck.

The invention comprises details which will be found in the following specification, reference being made to the drawings herewith and wherein:

Figure 1 is a side elevation of this jack at work on a wheel.

Fig. 2 is an enlarged vertical central longitudinal section through the jack showing two different forms of the engaging elements mounted therein. 7

Fig. 3 is a transverse section on the line 3-3 of Fig. 2.

In the drawings the numeral 1 designates a cross-head of appropriate size, having through its center a threaded hole 2 and near each end longitudinal upright slot 3, and downward through said hole is passed a main screw l having a head 5 at its upper end which may be square or of otherwise angular configuration o as to receive a proper wrench by which it is turned. The lower extremity of this screw may be flat if it is to engage the fiat end of a shaft, or it might have a fine point 6 as seen in Fig. 1 to enter the socket usually formed in the end of a shaft when the latter is made on a lathe. be of quite gentle pitch, although of suflicient size to have considerable strength.

Overlying each end or arm of the crosshead is a plate 10, and underlying the same another plate 11. The upper plate is provided centrally with a hole 12, and the lower plate may have asimilar central hole or may be of skeleton formation so that there is a considerable opening at its center. This hole is for the free passage of the shank of an engaging element, herein variously shown as a screw 14 with an I-head 15 or a T-head 16 for use as described below, and a nut 17 screws onto the upper projecting end of the element and bears against The threads on the screw t should the upper face of the plate 10, while the shank of said element passes downward through the slot 3, through the opening in the lower plate 11, and through the wheel or pulley P indicated in dotted lines in Fig. 1. If the same be a wheel having spokes, a pin is passed through the eye 15 of each screw 14:. If the wheel be a toothed wheel or pinion, the element may pass between its teeth and the T-head 16 may be em ployed and disposed transversely to the length of said teeth. Each plate 10 is provided with a mark 18,-and on the face of the cross-head are two scales 19 along which said marks move when the plates are adjusted outward and inward on the arms of the cross-head. The lines of said scales are inscribed with numerals indicating inches, and before applying the device to any kind of a wheel or pulley the latter will be measured to ascertain the distance from the axis of its hub to its periphery if an engaging element is to be passed by its periphery, or the distance from said axis to a point be tween its spokes where the head of an engaging element may be placed. Then the plates on the two arms are adjusted accordingly, as the scales 19 will permit, and as more fully described below.

Each upper plate is provided with a countersunk hole 22 at each side of its main or central hole 12, and downward through each hole 22 passes a screw 23 whose lower end screws into a hole 24C in the lower plate 11, leaving the head 25 of the screw free to revolve within the enlarged upper end of the hole 22 and flush with the upper face of the plate 10. This head is preferably provided with a nick for the insertion of a screwdriver. Thus by loosening these screws, the two plates can be adjusted simultaneously outward or inward along the slots 3 until the mark 18 comes opposite the proper and selected line on the scale 19 as above suggested, after which the screws 23 are set up tight to hold the plates in their adjusted position.

With all parts of appropriate materials and dimensions, the operation of this device is as follows :-Assumin that it is de sired to pull a wheel off 0 the shaft on which it is stuck, the diameter of the wheel is measured and the two pairs of plates appropriately set on the arms of the crosshead to bring their holes 12 just outside of the periphery of the wheel or just inside its 'the' shafthas such" a socket. screws 1% a r'ejnowpassed upward either 1nperiphery if said wheel has spokes; and then the screws are set up tight to hold these plates in their adpisted positlons at equal distances on opposite sides of the main or central hole 2. The cross-head is now laid acrosstheface of the wheel, and the main screw 4 passed down through the hole 2 with its tip engaging the extremity of the shaft, and the point (3 (if it has one) engagingthe socket in such extremity provided Two of the 'propriateiwrench is applied to the head 5'of the mainscrei Y 4 and slowl' turned and the result is that this screw is driven through the threaded hole2 and down onto the end of the" shaft, or in other words the cross head- 1 and" all parts carried by it are raised from the-shaft, and'the wheeler pulley is thereby forcibly slipped off of the same. If the nuts 17 onthe enga ing elements have first been set up quite tight, it is clear that tension impar'tecl' by setting up the'scrc'w 4; is equally distifibiited-between two points diametrically opposite the hub of the'wheel, and'therefore the'latter will be drawn off its shaft on a line strictlyalong the axis of vthe shaft projected-otheruuse the tool would possibly cant or deflect the hub of the wheel slightly during its removal, and the result would be that it would bind even tighter than formerly, on the shaft from which it is to be withdrawn. After the wheel has been drawn oif,the nuts 17 may be loosened so that the engaging elements release their grip on the rim of the wheel, and the latter can be taken out of place. In a complete equipment I preferably provide several pairs of the smaller screws 14: having variously shaped heads, and of the latter I- have illustrated onlytwo types, one having an eye 15 and the other having a T-shaped head 16, but; ohviously I: need not be'limited in this particular. I prefer to countersink the heads 25 of the screws 23 which connect the upper and lower plates, so that the nuts 17 may revolve freelyon the upper surface of the upper plates and possibly even move across the tops'of said heads as will be clear.

hat is claimed as new is In a wheel pulling jack, the combination with a: cross-head having a. central threaded hole and longitudinal slots in its arms on opposite sides of the same, and a main screw passing downward through said hole; of plates overlying and underlying each arm of the cross-head and provided with central openings, an. engaging element passing upward through the latter and threaded at its upper end, a nut on said ends resting on the: uppermost plate, the latter having countersunk holes at opposite sides of its open ing, and screws passing downward through said holes, through the slot in the arm, and engaging the lower plate, the heads of said screws standing within said countersunk holes, for the purpose set forth.

In testimony-whereof I afiix my signature.

LOUIS BERK.

Copies'of'this patent may be obtainedforfiv cents each; by'addressing the Commissioner of Patents,

7 i Washington, Di-G. 

